Android 14模拟器中Xamarin自定义AlertDialog二次打开后键盘失效问题

应用类型与测试环境 #

• Android应用类型：Xamarin.Forms应用、Xamarin.Android应用
• 受影响平台：Android 14模拟器（Pixel 7 Pro）
• 无问题测试平台：Android 13模拟器（Pixel 5）、Android 9模拟器（Pixel 2）、Android 14设备（Samsung S21FE）、Android 13设备（S20FE）

问题描述 #

使用AlertDialog中的EditText时，第二次打开弹窗后系统内置键盘可见但无法进行交互操作。

重现步骤 #

• 打开测试应用
• 点击“打开对话框”按钮
• 在EditText中输入任意内容并点击“确定”
• 此时键盘可见但无法交互

自定义AlertDialog代码 #

CustomAlertDialog.xml #

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
        android:id="@+id/contentview"
        android:padding="15dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/headerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Title"
        android:textStyle="bold"
        android:textSize="20dp"
        android:textColor="@android:color/black"/>
        <android.support.design.widget.TextInputLayout
                android:id="@+id/textinputlayout"
    android:layout_width="match_parent"
        android:layout_height="50dp">
        <EditText
                android:id="@+id/passwordedit"
                android:hint="Edit"
                android:layout_width="match_parent"
                android:layout_height="50dp"
                android:password="true"
                android:textStyle="normal"
                android:textSize="15dp"
                android:layout_marginLeft="-5dp"
                android:inputType="textPassword"/>
                </android.support.design.widget.TextInputLayout>
        <TextView
                android:id="@+id/errorview"
                android:text="Error"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textColor="@android:color/holo_red_dark"
                android:visibility="invisible"
                />
        <LinearLayout
                android:id="@+id/footerview"
                android:layout_width="match_parent"
                android:layout_height="50dp"
                android:orientation="horizontal"
                android:gravity="right"
                android:paddingRight="-15dp">
                        <Button
                                android:id="@+id/cancelbutton"
                                android:text="Cancel"
                                android:layout_width="wrap_content"
                                android:layout_height="match_parent"
                                android:background="@android:color/transparent"
                                android:textColor="#0080eb"/>
                        <Button
                                android:id="@+id/okbutton"
                                android:text="Ok"
                                android:layout_width="70dp"
                                android:layout_height="match_parent"
                                android:enabled="false"
                                android:textColor="@android:color/darker_gray"
                                android:background="@android:color/transparent"
                                
                />
        </LinearLayout> 
</LinearLayout>

CustomAlertDialog.cs #

using Android.App;
using Android.Content;
using Android.Graphics.Drawables;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Views.InputMethods;
using Android.Widget;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace AlertDialogIssue
{
    internal class CustomAlertDialog : LinearLayout, IDisposable
    {
        private Context mainContext;
        private LinearLayout contentView;
        private AlertDialog passwordDialog;
        private AlertDialog.Builder alertbuilderpassword;
        internal bool isPasswordDialogAppearing = false;
        private View currentView;
        private EditText passwordEdit;
        private Button okButton;
        private Button cancelButton;
        private TextView headerView;
        private LayoutInflater inflater;

        internal CustomAlertDialog(Context context)
          : base(context)
        {
            mainContext = context;
            inflater = (LayoutInflater)context.GetSystemService(Context.LayoutInflaterService);
            View view = inflater.Inflate(Resource.Layout.CustomAlertDialog, this, true);
            InflateView(view);
        }
        internal void InflateView(View view)
        {
            currentView = view;
            contentView = view.FindViewById<LinearLayout>(Resource.Id.contentview);
            headerView = view.FindViewById<TextView>(Resource.Id.headerView);
            passwordEdit = view.FindViewById<EditText>(Resource.Id.passwordedit);
            okButton = view.FindViewById<Button>(Resource.Id.okbutton);
            cancelButton = view.FindViewById<Button>(Resource.Id.cancelbutton);
            InitializePasswordView();
            DisplayAlertDialog();
        }
        internal void InitializePasswordView()
        {
            passwordEdit.TextChanged += PasswordEdit_TextChanged;
            passwordEdit.KeyPress += PasswordEdit_KeyPress;
            okButton.Click += OkButton_Click;
            cancelButton.Click += CancelButton_Click;
        }
        internal void ShowPasswordInputDialog()
        {
            if (passwordDialog != null)
            {
                passwordDialog.Dismiss();
            }

            if (!isPasswordDialogAppearing)
            {
                passwordDialog.Show();
                isPasswordDialogAppearing = true;
            }
        }
        internal void DisplayAlertDialog()
        {
            alertbuilderpassword = new AlertDialog.Builder(mainContext);
            alertbuilderpassword.SetView(currentView);
            alertbuilderpassword.SetCancelable(false);
            passwordDialog = alertbuilderpassword.Create();
            passwordDialog.Window.SetSoftInputMode(SoftInput.StateAlwaysVisible);
            passwordDialog.Window.SetLayout(400, 400);
        }

        private void CancelButton_Click(object sender, EventArgs e)
        {
            passwordDialog.Dismiss();
            isPasswordDialogAppearing = false;
        }

        private void OkButton_Click(object sender, EventArgs e)
        {
            passwordDialog.Dismiss();
            passwordDialog.Show();
            passwordEdit.SetSelectAllOnFocus(true);

            passwordEdit.SetSelection(passwordEdit.Length());
            passwordEdit.SelectAll();
        }

        private void PasswordEdit_KeyPress(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keycode.Enter)
            {
                passwordDialog.Dismiss();
            }
            else if (e.KeyCode == Keycode.Back)
            {
                passwordDialog.Dismiss();
            }
            else if (e.KeyCode == Keycode.Del)
            {
                if (!string.IsNullOrEmpty(passwordEdit.Text))
                {
                    string tempString = passwordEdit.Text;
                    if (passwordEdit.HasSelection)
                    {
                        passwordEdit.Text = string.Empty;
                    }
                    else
                    {
                        passwordEdit.Text = tempString.Remove(tempString.Length - 1);
                        int position = passwordEdit.Length();
                        passwordEdit.SetSelection(position);
                    }
                }
            }
        }

        private void PasswordEdit_TextChanged(object sender, global::Android.Text.TextChangedEventArgs e)
        {
                okButton.Enabled = true;
        }
    }
}

弹窗调用方式 #

在主Activity中通过以下代码调用自定义弹窗：

customAlertDialog.ShowPasswordInputDialog();

临时解决方法 #

移除DisplayAlertDialog方法中的passwordDialog.Window.SetSoftInputMode(SoftInput.StateAlwaysVisible);可避免键盘无法交互的问题，但弹窗再次打开时不会自动唤起键盘。

需求 #

寻求自定义AlertDialog打开关闭的替代方案，或该BUG的有效上报途径（已尝试Xamarin及微软问答平台，均未被认定为官方问题）。

内容的提问来源于stack exchange，提问作者ManojSF3414